Implement "appinstalled" event on Android.

third_party/WebKit/Source/core/events/EventTarget.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 291 matching lines @@
 }
 
 void EventTarget::addedEventListener(
     const AtomicString& eventType,
     RegisteredEventListener& registeredListener) {
   if (eventType == EventTypeNames::auxclick) {
     if (LocalDOMWindow* executingWindow = this->executingWindow()) {
       UseCounter::count(executingWindow->document(),
                         UseCounter::AuxclickAddListenerCount);
     }
+  } else if (eventType == EventTypeNames::appinstalled) {
+    if (LocalDOMWindow* executingWindow = this->executingWindow()) {
+      UseCounter::count(executingWindow->document(),
+                        UseCounter::AppInstalledEventAddListener);
+    }
   } else if (EventUtil::isPointerEventType(eventType)) {
     if (LocalDOMWindow* executingWindow = this->executingWindow()) {
       UseCounter::count(executingWindow->document(),
                         UseCounter::PointerEventAddListenerCount);
     }
   } else if (eventType == EventTypeNames::slotchange) {
     if (LocalDOMWindow* executingWindow = this->executingWindow()) {
       UseCounter::count(executingWindow->document(),
                         UseCounter::SlotChangeEventAddListener);
     }
@@ skipping 432 matching lines @@
   // they have one less listener to invoke.
   if (d->firingEventIterators) {
     for (const auto& iterator : *d->firingEventIterators) {
       iterator.iterator = 0;
       iterator.end = 0;
     }
   }
 }
 
 }  // namespace blink